Abstract
We report the experimental demonstration of a low-frequency magnetoelectric (ME) wireless power transfer (WPT) system, including a tri-layered chip-sized ME transducer and a suitable, self-powered power management circuit (PMC) for powering Implantable Medical Devices (IMDs). The ME transducer is designed to operate at a resonance frequency of 50 kHz, which is therapeutically relevant for IMD applications. Experimentally, the device is shown to operate at an AC magnetic field of 40µT without any DC biasing, generating output voltage of around 0.4 V. Further, a novel, low-voltage regulation PMC is interfaced with the ME transducer that enables synchronous electric charge extraction (SECE). The PMC circuit is fabricated on a standard 2-layer PCB and is shown to work for an input voltage range 0.35-10 V to generate 2.5 V regulated DC voltage with intrinsic current consumption less than 1 µA and conversion efficiency > 80%.
Published Version
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